fix imports

Author: sixolet

mypy/exprtotype.py

@@ -5,7 +5,9 @@
     ListExpr, StrExpr, BytesExpr, UnicodeExpr, EllipsisExpr, CallExpr,
 )
 from mypy.parsetype import parse_str_as_type, TypeParseError
-from mypy.types import Type, UnboundType, ArgumentList, EllipsisType, AnyType, Optional
+from mypy.types import Type, UnboundType, ArgumentList, EllipsisType, AnyType
+
+from typing import Optional, List
 
 
 class TypeTranslationError(Exception):

mypy/typeanal.py

@@ -1,7 +1,7 @@
 """Semantic analysis of types"""
 
 from collections import OrderedDict
-from typing import Callable, cast, List, Optional
+from typing import Callable, cast, List, Optional, Set
 
 from mypy.types import (
     Type, UnboundType, TypeVarType, TupleType, TypedDictType, UnionType, Instance,